When I want to run this code in ECLiPSe-CLP I get the following Error
Error:
string stream 27: syntax error: postfix/infix operator expected
| 4 $= X^2 + Y^2, (Error Mark is under '=')
|
Code:
circles(X, Y) :-
4 $= X^2 + Y^2,
4 $= (X - 1)^2 + (Y - 1)^2,
X $>= Y.
The $=/2 operator/predicate is a library predicate. Are you loading the library defining it? E.g.
[eclipse 12]: lib(ic).
...
Yes (0.12s cpu)
[eclipse 13]: [user].
circles(X, Y) :-
4 $= X^2 + Y^2,
4 $= (X - 1)^2 + (Y - 1)^2,
X $>= Y.
^Dtty compiled 4024 bytes in 0.00 seconds
Yes (0.00s cpu)
[eclipse 14]: circles(X, Y).
X = X{-1.0000000000000004 .. 2.0000000000000004}
Y = Y{-1.0000000000000004 .. 2.0000000000000004}
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